Art of casting metals.



Nu. 77mm UN Tnn STATES Patented October 18. 1904.

PATENT OFFICE.

ouAsLEs's'r; on, ornuw' YORK, N. r ussrouot, BY MESNE ASSIGNMENTS, Torun ME'JIAL cAsTINo COMPANY or AMERICA.

ART OF onsrmo METALS.

. SZPECIEIGATIDN" forming part of Letters Patent 3570. 772,440, datedOctober 18, 1904.

Application filed June 19, 1903; Renewed Hersh l6, 190 i. SerialNcfllQSASfi. (N specimens.)

To all reborn it may concern:

I am aware, this result has not been attained.

It is also a common occurrence to find metallic articlescast in metalmolds full of blow-- holes or having a certain degree of porosity due tothe included gases.

1 have discovered that in order to successfully cast molten iron andsteel in a metal mold and to keep the surfaces of the article cast fromchilling-Lend also to obtain a casting of more compact and uniformtexture than is usually obtained, certain Conditions must be fulfilled,namely; First, the surface of the mold which is to come in contact withthe molten metal must be coated with a wash spread uniformly over saidsurfacc; second, that this coating must be of such a nature that it willadhere to said surfacc,'although submitted to the influence of,g'rcatlywarying temperatures; i: r d, that this wash employed mustleave a th' coating; hctwccn thc surface of the mold and the casting,which coating shall not act either u pen the metal of the mold or themetal. of the casting; fourth, that this wash must be composed of aninorganic substance which will produce said ingr't coating and a liquidsubstance of such consstcncy and quality as will hold the inorganicsubstance in suspension; fifth, that this liquid medium shall beinflammable from contact with the molten metal of the casting; sixth,that this liquid substance must not, however, be so volatile that itscontact with the molten metal will generate gases too rapidily and causeby their generation and ignition ex plosious that would endanger thework and tile workmen; seventh, that this liquid substance or medium involatilizing and burning shall generate 5 sufiicient gas to carry-"offwith it the included gases of the molten metal. l/Vhen these conditionsare maintained, a casting will be produced in a metal mold whereof thesurfaces will be soft and workable and the metal of uniform closetexture and free from porosity or pitting. The casting may also bereadily "removed from the mold, as there will be no adhcsions. For theinert coating-body of the wash any inorganic substance may be used whichhas no chemical action on either the metal of the mold or the metal ofthe casting that will not decompose and combine with either under theconditions to which it is exposed in the mold. For the vehicle of saidinorganic substance, 5 said vehicle having the inflammable andgasproducing requisites, mineral oils of various kinds will serve. As anexample of the wash I prefer to employ the following: French chalk, inpowder, twenty parts; kerosene, of 7 over one hundred and fifty flashtest, forty parts; paraiiin-oil, refined, forty parts. These are mixedthoroughly together, the fluid in-' gredients holding the chalk insuspension. I

In carrying" out the process of making a '75 casting the inner surfacesof the metal mold are evenly. coated with the above compound or washwith the aid of a brush or any other suitable tool or implement,tli'lnold closed, and the molten iron or steel poured in. When 30 themold is opened, the casting may be read ily removed, andwhcn cooled itwill be found to be smooth, free from porosity or blowholes, withoutchill or surface hardening, and of uniform compact texture when itsfracture 35 is examined.

The invention is not ofcourse limited strictly to the particularingredients and proportions thereof given in the above example. Thevehicle for the French chalk will be of 9 paraffin and kerosene or theirequivalents;

The'particular mold-coating described above is not claimed herein, asthis is embodied and claimed in a separate application. Having thusdescribed -my invention, 'I claim 1 1. The herein-described improvementin the art of casting iron and steel in metal molds,

which consists in first coating the interior suri liquitl vehicle ofperzii'lin and kerosene or their faces of the mold with a costing-Washconiequivalents, and an inorgei'zicsubstance which 5 posed of an inertinorganic substance which hull substantially no chemical action oneither will have no chemical action on either the l the metal of theIDOlll or the molten metal metal of the mold or the metal of thecasting, during the operating of casting substantially and a vehicle ofpnrnliiu and kerosene or their described. i equivalents, then closingthe molt-l, and then in witness whereof I have hereunto signed 20filling the letter with the molten motel. my name, this 9th (lay ofJune, 1903, in the 2. An iron or steel casting made from a F presence oftwo subscribing witnesses. 10 metal mold, having a smooth, soft,workable CHARLES SR SZEKELY S surface, free from blow-holes, and acompact ig texture, said mold having been coated on its HENRY CONNETLinterior surfaces with a Wash composed of a WILLIAM J. FIRTH.

